SYM Voyager / GTS 125i Evo (Joymax 125i) — OEM Fluid, Tire Pressure & Maintenance Specs
124.5cc Liquid-Cooled Single SOHC 4-Valve Ceramic Cylinder · Source: SYM Voyager / GTS 125i Evo (Joymax 125i) (2010–2020) Official Owner’s Manual Maintenance Specifications
According to the SYM Voyager / GTS 125i Evo (Joymax 125i) (2010–2020) Official Owner’s Manual Maintenance Specifications, the 2010–2020 SYM Voyager / GTS 125i Evo (Joymax 125i) (chassis LM12W/LN12W) requires 0.85 L (0.90 US qt) of SAE 10W-40 (JASO MB, API SJ/SL Synthetic Blend 10W-40) engine oil for a drain-only change and 0.95 L (1.00 US qt) with filter service (15421-GY6-900 (Strainer Screen & O-Ring)). Standard solo cold tire pressure is 175 kPa / 1.75 bar / 25 PSI front (110/90-13 56P (or 120/70-14)) and 225 kPa / 2.25 bar / 33 PSI rear (130/70-12 64P (or 140/60-13)), paired with 1× NGK CR8E spark plug(s) and a YTX9-BS battery.
Drain only: 0.85 L (0.90 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~402 km (250 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Centrifugal CVT Belt Drive |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MB · API SJ/SL Synthetic Blend 10W-40 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.85 L (0.90 US qt) • With filter/strainer: 0.95 L (1.00 US qt) • Complete dry overhaul: 1.05 L (1.11 US qt) |
| OEM Oil Filter Code & Type | 15421-GY6-900 (Strainer Screen & O-Ring) |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 25 N·m (18.4 lb-ft / 2.55 kgf·m) — Use fresh crush washer |
| Final Drive / Bevel Gear Oil | 110 ml (0.11 L) — SAE 85W-140 / 10W-40 (110–180 ml rear reduction gear oil) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 110/90-13 56P (or 120/70-14) · Rear: 130/70-12 64P (or 140/60-13) (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 175 kPa / 1.75 bar / 25 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 185 kPa / 1.85 bar / 27 PSI Rear: 245 kPa / 2.45 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK CR8E × 1 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | YTX9-BS (12V 8.0Ah MF AGM) |
| Final Drive Maintenance | Dry Centrifugal V-Belt CVT — Inspect/replace V-belt and rollers every 15,000–20,000 km |
| Brake Fluid & Coolant | DOT 4 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 125 cc · 13 hp @ 8,750 rpm · 10.9 N·m (8.0 lb-ft) @ 7,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 750 mm (29.5 in) · 168 kg (370 lbs) |
| Fuel Tank & Est. Real-World Range | 12 L (3.2 US gal) · ~33.5 km/L → ~402 km (250 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 300 km • Engine Oil / Filter: 3,000 km / 6,000 km • Air Filter / Spark Plug: 6,000 km / 10,000 km • Valve Clearance Check: 10,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Long-distance 125cc maxi-scooter staple evolving from GTS 125i Evo (13/12-inch wheels) into the larger-wheeled Joymax 125i.
Oil & Clutch Mechanical Engineering Note
Pulling a 168 kg touring body on a 0.9 L mesh-screen sump demands strict 2,500–3,000 km changes of SAE 10W-40 JASO MB plus 110 ml rear gear oil.